Liquid fuel control means



Ap l, 1941. s. w. E. ANDERssoN LIQUID FUEL CONTROL MEANS Filed laren 30.i957 wm, YM. hm,

Patented Apr. 1, 1941 LIQUID FUEL CONTROL MEANS Sven W. E. Andersson,Evansville, Ind., assignor to Servel, Inc., New York, N. Y., acorporation of Delaware Application March 30, 1937, Serial No. 133,781

5 Claims. (Cl. 137-68) My invention relates to liquid fuel burners andmore particularly to safety control mechanism for such burners.

It is an object of my invention to provide an improved safety valve forliquid fuel burners and more particularly an improved overflow cutoffvalve for a float valve controlled burner.

'Ihe single figure of the drawing shows more or less diagrammatically aliquid fuel burner embodying the invention.

A burner w-ell III is provided with' a combustion chimney II. The burnerwell I is connected by a burner tube I2 and a passage I3 to a floatchamber I4. Liquid fuel, such as kerosene, is supplied to the floatchamber I4 from a supply conduit I5. Flow of kerosene from the supplyconduit I5 into the float chamber I4 is controlled by a valve member I6.

The valve member I6 engages or seats, when closed, on the lower part ofa conical valve seat I1. The valve member I6 is provided with a head I8slidable in a sleeve member I9. A spring 2|) exerts a force between theupper closedend of the sleeve I9 and the valve head I8 so that the valvemember I 6 is normally held with respect to the sleeve I9 in theposition shown. The sleeve member I9 is vertically slidable in a guide2|. 'Ihe upper end of the sleeve I9 is provided with an enlargement 22which projects through an opening in the cover plate 23 of the floatchamber I4.

A float 24 is connected to one end of a lever 25. The other end of thelever 25 is bifurcated,'the prongs 26 engaging beneath the enlargedportion 22 of the valve sleeve I9. The lever 25 is pivoted at 21 on alug 28 projecting downward from the float chamber cover plate 23.

When the level of kerosene in the float chamber I4 is below a determinedlevel such as that indicated by the line A, the float 24 is downwardfrom the position shown in the drawing causing lever 25 to raise thesleeve I9 and valve I6. This permits kerosene to flow from the supplyconduit I5 into the float chamber 24, passage I3, and burner tube I2.When kerosene reaches the level A, the float has been raised to theposition shown, permitting the valve I6 to shut under the force oflgravity to cut off ow of kerosene into the valve chamber. Thisoperation of valve I6 by float 24 regulates the flow of kerosene so thatthe liquid level in oat chamber I4 is maintained at the desired level A.The rate of ow of liquid from the iioat chamber to the burner maybeadjusted by a valve member 29 controlling a valve passage 30 betweenpassage I3 and the lower end of the burner tube I2.

On the top of the oat chamber cover plate 23 is provided a snap actionspring toggle comprising a lever 3| pivoted at 32 on a projection 33screwed into the cover plate. A spring 34 is held under compressionbetween an adjustable pivot 35 and one end 36 of the lever 3|. On theother end of the lever 3| .there is suspended a bucket 31. The bucket 31is provided with a handle 38 which is pivotally connected to the lever 3I. The lever 3| overlies the projecting portion 22 of the valve sleeveI9. A projection 39 on the post 33 provides a stop for the lever 3| inthe position shown. The bucket 31 hangs under a spout 40 provided in theupper part of the casing of the float chamber I4. The opening in thefloat chamber I4 provided by the spout 40 is at a level above the normallevel of liquid A in the float chamber.

If for any reason, such as faulty operation of valve I6, the level ofliquid in the l'oat chamber I4 rises to the level of the spout 4I),Akerosene overflows and is directed by the spout into the bucket 31. Asthe bucket 31 fllls with kerosene its weight increases until it exceedsthe force necessary to operate the toggle mechanism which thereuponsnaps across dead center so that the lever 3| descends upon theprojection 22. As

lever 3| descends upon the projection 22, the l valve sleeve I9 andvalve member I6 are forced downward. The valve member I6 is stopped bythe lower part of the valve seat I1, but, under the force of the toggle,the valve sleeve I9 moves downward, compressing spring 20, until thelower end of the sleeve I9 comes into contact with the upper part of thevalve seat I1. The lower end of the sleeve I9 is formed as a valvemember which seats securely on the seat I1 to cut off ow of keroseneinto the valve chamber I4 until the bucket 31 is empty and the togglemechanism re set to the position shown.

Various modifications and changes will occur to those skilled in the artwherefore the invention is not limited as set forth in the specificationand drawing but only as indicated in the following claims.

I claim:

1. Control mechanism for liquid fuel burner including a valve having twomembers one of which telescopes into the other, a float connected tooperate said members to cause only one of them to open and close, andmeans other than said float operable to cause telescoping of saidmembers and movement of both said members to their closed positions.

2. In a liquid fuel burner having a iloat and a valve operated therebyfor regulating supply of A fuel to the burner, that improvement whichconsists in a second valve including a member telescopically arrangedwith respect to said float operated valve, and means other than saidfloat for moving said second valve member to its closed position to cutoi flow of fuel to the burner.

3. Liquid control mechanism including two valves veach being adapted byitself to shut olf flow of liquid. means responsive to liquid level fornormally operating one of said valves, and means independent of saidliquid level responsive means for operating both of said valves.

4. Control mechanism for liquid fuel burner closing one of said valvemembers, and a safety device such as a liquid overflow trip for closingboth of said valve members irrespective of the relative positions ofsaid valve members.

4SVEN' W. E. ANDERSSON.

